<div id="rect1" style="top: 5px; left: 5px; width: 10px; height: 10px; position: absolute;"></div>
<div id="rect2" style="top: 10px; left: 5px; width: 15px; height: 20px; position: absolute;"></div>
<iframe id="nested" style="top: 10px; left: 10px; position: absolute; width: 15px; height: 20px" src="_assets/rect.html"></iframe>
<iframe id="deepnested" style="top: 10px; left: 10px; position: absolute; width: 15px; height: 20px" src="_assets/framerect.html"></iframe>
